DataGridView Validating event set cell value

Posted on 2008-10-01
Last Modified: 2012-08-14
Inside the DataGridView validating event I want to set the cell's value. For example, if a user types in CA I would like to replace it with CALIFORNIA. How do you do that?

The .value description says that sets the cell value but it does not do it in the validating event.
Question by:DreamU
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LVL 48

Expert Comment

ID: 22622247
Can you show us what you have ?
LVL 96

Accepted Solution

Bob Learned earned 125 total points
ID: 22624018
You could set up the DataGridView to work in the virtual mode, and use an internal business object to show/store data.

    Private Class ShippingRecord
        Public DateSent As Date
        Public ShipToState As String
    End Class
    Private m_list As New List(Of ShippingRecord)
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For i As Integer = 0 To 10
            Dim rec As New ShippingRecord()
            rec.DateSent = Now.AddDays(i)
            rec.ShipToState = ""
        Me.dgv.RowCount = 10
        Me.dgv.ColumnCount = 2
    End Sub
    Private Sub DataGridView1_CellValueNeeded(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellValueEventArgs) Handles dgv.CellValueNeeded
        If e.ColumnIndex = 0 Then
            e.Value = m_list(e.RowIndex).DateSent.ToShortDateString()
        ElseIf e.ColumnIndex = 1 Then
            e.Value = m_list(e.RowIndex).ShipToState
        End If
    End Sub
    Private Sub dgv_CellValuePushed(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellValueEventArgs) Handles dgv.CellValuePushed
        If e.ColumnIndex = 1 Then
            Select Case e.Value
                Case "CA"
                    m_list(e.RowIndex).ShipToState = "CALIFORNIA"
                Case "OR"
                    m_list(e.RowIndex).ShipToState = "OREGON"
                Case "WA"
                    m_list(e.RowIndex).ShipToState = "WASHINGTON"
            End Select
        End If
    End Sub

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LVL 96

Expert Comment

by:Bob Learned
ID: 22624025
.designer code:

        Me.dgv = New System.Windows.Forms.DataGridView
        CType(Me.dgv, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.dgv.AutoSizeColumnsMode = System.Windows.Forms.DataGridViewAutoSizeColumnsMode.Fill
        Me.dgv.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize
        Me.dgv.Location = New System.Drawing.Point(141, 116)
        Me.dgv.Name = "dgv"
        Me.dgv.RowHeadersVisible = False
        Me.dgv.Size = New System.Drawing.Size(339, 299)
        Me.dgv.TabIndex = 0
        Me.dgv.VirtualMode = True

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Author Comment

ID: 22630733

In order to illustrate here is the entire program for Form1 for which the only design element on form1 is a DataGridView with 3 columns: city, state and country. There is no data source - just the grid itself.

After entering CA in the state column, the code sets its value to CALIFORNIA. The message box displays the state value when I leave the next column which is country. The state value still shows as CA in both the cell display and in the message box.

Private Sub DataGridView1_CellValidating(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating
        Select e.ColumnIndex
            Case 1
                If e.FormattedValue = "CA" Then
                    DataGridView1(e.ColumnIndex, e.RowIndex).Value = "CALIFORNIA"
                End If
            Case 2
                MsgBox(DataGridView1("state", 0).Value)
        End Select
    End Sub

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Author Comment

ID: 22630766

Wow, I appreciate the effort you put into providing an alternative.

However, my actual program consists of several data grids all bound to datasources with hundreds of lines of code which is almost ready for release. This would require a large code change and I am not ready for the kind of re-testing that would be required.
LVL 96

Expert Comment

by:Bob Learned
ID: 22634620
Ok, good luck finding a solution.

Author Comment

ID: 22763388
I need to close this item. With no direct answers I assume there is no way to set the cell's value inside a validating event.

I have foregone the functionality however TheLearnedOne provided the only work-around which may benefit others.

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